/**
 * @description: 自定义指令：按钮水波纹效果
 * @ 接受参数 
 * @ type: string 点击位置扩散
 * @ color: string 颜色
 */
 import './index.css'

 const context = '@@wavesContext'
 
 function handleClick(el, binding) {
   function handle(e) {
     const customOpts = Object.assign({}, binding.value)
     const opts = Object.assign({
       ele: el, // 波纹作用元素
       type: 'hit', // hit 点击位置扩散 center中心点扩展
       color: 'rgba(0, 0, 0, 0.15)' // 波纹颜色
     },
     customOpts
     )
     const target = opts.ele
     if (target) {
       target.style.position = 'relative'
       target.style.overflow = 'hidden'
       const rect = target.getBoundingClientRect()
       let ripple = target.querySelector('.waves-ripple')
       if (!ripple) {
         ripple = document.createElement('span')
         ripple.className = 'waves-ripple'
         ripple.style.height = ripple.style.width = Math.max(rect.width, rect.height) + 'px'
         target.appendChild(ripple)
       } else {
         ripple.className = 'waves-ripple'
       }
       switch (opts.type) {
         case 'center':
           ripple.style.top = rect.height / 2 - ripple.offsetHeight / 2 + 'px'
           ripple.style.left = rect.width / 2 - ripple.offsetWidth / 2 + 'px'
           break
         default:
           ripple.style.top =
             (e.pageY - rect.top - ripple.offsetHeight / 2 - document.documentElement.scrollTop ||
               document.body.scrollTop) + 'px'
           ripple.style.left =
             (e.pageX - rect.left - ripple.offsetWidth / 2 - document.documentElement.scrollLeft ||
               document.body.scrollLeft) + 'px'
       }
       ripple.style.backgroundColor = opts.color
       ripple.className = 'waves-ripple z-active'
       return false
     }
   }
 
   if (!el[context]) {
     el[context] = {
       removeHandle: handle
     }
   } else {
     el[context].removeHandle = handle
   }
 
   return handle
 }
 
 export default {
   bind(el, binding) {
     el.addEventListener('click', handleClick(el, binding), false)
   },
   update(el, binding) {
     el.removeEventListener('click', el[context].removeHandle, false)
     el.addEventListener('click', handleClick(el, binding), false)
   },
   unbind(el) {
     el.removeEventListener('click', el[context].removeHandle, false)
     el[context] = null
     delete el[context]
   }
 }
